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Finding the Fourth Proportional to 926.88, 1,390.79 and 439.94

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Solution

The fourth proportional to 926.88, 1,390.79 and 439.94 is: 660.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.88 : 1,390.79 = 439.94 : x
  2. Step 2: Convert to fraction form
    926.88/1,390.79 = 439.94/x
  3. Step 3: Cross multiply
    926.88x = 1,390.79 × 439.94
  4. Step 4: Simplify right side
    926.88x = 611,858.30
  5. Step 5: Solve for x
    x = 611,858.30/926.88
  6. Step 6: Final answer
    x = 660.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.